Sidekick by Hubspot - Customer insight integrated with your email tools.
Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
Sansan - Sansan provides a internal contact sharing service for companies.
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
HiHello - Exchange contacts, seamlessly.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.